muscular system notes Flashcards
Which types of muscle tissue has involuntary regulation of contraction?
Cardiac and smooth muscle
What muscle tissue type consists of single, very long, cylindrical multinucleate cells with striations?
Skeletal muscle
What is the plasma membrane of a muscle cell called?
Sarcolemma
What is composed of myosin protein?
Thick filaments
What do the axon terminals of a nerve cells and the sarcolemma of a skeletal muscle cell join at?
Neuromuscular junction
What function do calcium ions preform during skeletal muscle contraction?
Expose myosin binding sites on actin
What is Acetylcholine?
A neurotransmitter that stimulates skeletal muscle
Neurotransmitters are released upon stimulation from a nerve impulse by the ___________.
Axon terminals of the motor neuron
During skeletal muscle contraction, myosin cross bridges attach to active sites of __________.
Actin filaments
What even must occur first to trigger the skeletal muscle to generate an action potential and contract?
Acetylcholine binds to its receptor on the muscle membrane
How does a skeletal muscle twitch differ from a tetanic contraction?
A muscle twitch is a brief and jerky movement, while the tetanic contraction is prolonged and continuous
How is the condition of skeletal muscle fatigue best explained?
Insufficient quantities of ATP due to excessive consumption that leads to an inability to reset the nerve/muscle complex
What is one NON isotonic muscle action?
Pushing against a stationary wall
What is the insertion of the gluteus maximus?
Femur
What muscle closes the jaw?
Masseter
What are three muscles involved in hand/finger movement?
Flexor carpi radialis, flexor carpi ulnaris, and extensor digitorum
What muscle inserts in the heel bone?
Soleus
What muscle is used to whistle or play the trumpet?
Buccinator
What muscle is involved in the abduction of the arm at the shoulder joint?
Deltoid
Where is the origin of the biceps brachii located?
Shoulder
